<template>
  <div id="app">
    4.学生信息管理
    <div>
      <span>姓名:</span>
      <input type="text" v-model="name" />
    </div>
    <div>
      <span>年龄:</span>
      <input type="number" v-model="age" />
    </div>
    <div>
      <span>性别:</span>
      <select v-model="gender">
        <option value="男">男</option>
        <option value="女">女</option>
      </select>
    </div>
    <div>
      <button @click="add">添加/修改</button>
    </div>
    <div>
      <table border="1" cellpadding="10" cellspacing="0">
        <tr>
          <th>序号</th>
          <th>姓名</th>
          <th>年龄</th>
          <th>性别</th>
          <th>操作</th>
        </tr>
        <tr v-for="(item, index) in list" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ item.name }}</td>
          <td>{{ item.age }}</td>
          <td>{{ item.gender }}</td>
          <td>
            <button @click="remove(index)">删除</button>
            <button @click="edit(index)">编辑</button>
          </td>
        </tr>
      </table>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      list: [
        { name: "zs", age: 22, gender: "男" },
        { name: "ls", age: 20, gender: "女" },
      ],
      name: "",
      age: "",
      gender: "男",
      idx:null
    };
  },
  methods: {
    add() {
      // console.log(this.i);
      if (this.name === "" || this.age === "") return alert("内容不能为空");
      const obj = {
        name: this.name,
        age: this.age,
        gender: this.gender,
      };
      (this.name = ""), (this.age = "");
      if (this.idx !== null) {
        return this.list.splice(this.i, 1,obj);
      } 
      this.list.push(obj);
    },
    remove(index) {
      this.list.splice(index, 1);
    },
    edit(index) {
      this.list.forEach((item, i) => {
        if (i === index) {
          (this.name = item.name),
          (this.age = item.age),
          (this.gender = item.gender);
          this.idx = index
        }
      });
      // console.log(this.i);
    },
  },
  computed: {},
};
</script>
